Fin or non-fin seal wood pile?

A home owner says:
I am looking for wool pile weather stripping 3/16 inch wide by 3/16 inch high. I found it from your website, with fin seal (gray) or non-fin seal (white). Color is not a matter but I'm wondering if I need a fin or non-fin seal wool pile weatherstrip. Thanks!
Profile picture of Tom
Tom from SWISCO responded:
It's probably best to replace your wool pile with what you had before. That fin can sometimes provide a better seal, but if your window is not meant to have that kind of wool pile it may also cause too much friction, which would make your window harder to open and close.
Reply to Thread
Use this form to ask a follow-up question or to share your experience regarding this subject.
(your email address will be kept private and is only used to inform you when a response has been made)
Current wait time is 4-7 business days
We promise that one of our experts will personally get back to you as soon as they are able. Thank you very much for your patience and understanding. If your inquiry is time-sensitive, please feel free to reach us at 856-317-6263 or at